Brake-shoe.



PITZ WILLIAM SARGENT.

BRAKE SHOE.

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1,026,928, Patented May 21, 1912.

ATTORNEY UNITED sTATEs PATENT oEEIoE.

FITzI WILLIAMSARGENT, or Man-WAH, NEW JERSEY, AssIGNoE To EDWARDHUNTINGTON FALLOWS, 0F NEW YORK, N. Y.

BRAKE-SHOE.

Specification of Letters Patent.

Paten'teaMay 21, 1912.

Application led August 8, 1911. Serial No. 643,032.

To all whom it may concern:

Be it known that I, Frrz WILLIAM SAR- GENT, a citizen of the UnitedStates, and a resident of Mahwah, in the county of Bergen and State ofNew Jersey, have made and invented certain new and useful Improvementsin Brake-Shoes, of which the 'following is a specification.

My invention relates to brake shoes of the type having a body portionformed from cast iron and adapted to contact with l kind or styleheretofore in use, the 'comparatively t-hin flange of the wheel becomesexcessively heated when the shoe is applied to the wheel, the effect ofsuch being to injure the flange as by causing cracks to form and developtherein; the object of my invention, more specifically stated, is toprovide a brake shoe in which there will be materially less heating ofthe flange of the wheel and proportionately less injury to the flange,than has heretofore been the case.

In order to secure the results above enumerated, I provide a brake shoeformed preferably from cast iron, having a tread portion adapted tocontact with the tread of the wheel, and a flange portion adapted to ocontact with the flange of the wheel and having one or more recesses orpockets located entirely within said flange portion of the shoe, thesepockets being filled with a composition composed principally or entirelyof a non-metallic or semi-metallic substance or substances selected andcompounded with a View to avoiding as much as possible any grindingaction between the flange of the shoe and the wheel flange and anincident generation of beat such as isV commonly met with and by reasonof which the 'flange of the wheel becomes highly heated v'and injured asabove explained.

In my improved brake shoe the friction,

. and consequent braking action, due to contact between the tread of theshoeand that of the wheel is in no way reduced; while the frictionbetween the flange of the shoe and that of the wheel, and the resultingheating effect upon the Hange due to such friction, is materiallyreduced. The flange portion of the shoe, therefore, ceases to contributematerially to the retarding or braking action of the shoe as a whole,and-acts chiefly as a guide to retain the shoe in place, the brakingaction of the shoe being due for the most part to friction generatedbetween the tread portion of the shoe and that of the wheel.

The composition with which the recesses i ,or pockets in the shoe arefilled is such as will compact and polish without wearing rapidly away,or being affected by the heat generated; it is preferably composed inpart of materials having a high specific heat, as compared with thespecific heat of the material from which the shoe is formed, and alsopossessing lubricating properties so that the composition in addition tobeing non-grinding in its nature, will also secure a certain amount oflubricating action between the flange of the shoe and the flange of thewheel tending to avoid the heating of the latter.

Vith the objects above enumerated in View, my invention consists in theimproved shoe illustrated in the accompanying drawing, described in thefollowing specification. and particularly claimed in the clauses of theconcluding claim, and in such variations and modifications thereof aswill be obvious to those skilled in the artto which my inventionrelates.

In the accompanying drawing wherein the preferred' embodiment of myinvention is illustrated, .Figure 1 is a view showing the wearing faceof my improved brake shoe, that is, the face which contacts with thewheel; Fig. 2 is a view showing a section upon atransverse planeindicated by the line 2--2, Fig. l, and: Figs. 3 and 4 are views similarto Fig. l, but showing slightly modified forms of my improved shoe.

In the drawing, 5 represents the body portion of my improved brake shoe,adapted to contactl with the tread of a car wheel and preferably formedfrom cast iron in order to secure sufficient friction between the shoeand the car wheel for effective braking action. The shoe is providedwith a flange 6 adapted to engage the flange of the wheel,

and 7 represents a mass of non-metallic or semi-metallic materiallocated entirely 1n the flange portion of the shoe, and contained withina recess or pocket provided for its reception therein. The non-metallicmaterial may be in a single mass as shown in Figs. 1' and 2, or it maybe divided intotwo or more bodies as shown at 8 and 9 in Figs. 3 and et.

In Fig. 4, I have shown pockets filled with a non-metallic material" 9,and,`in addition, openings 1'0 extending through the flange port-ion 6of the shoe. These openingspermit material, worn from the face of theshoe and from the bodies of 4non-metallic material, to readily escapefrom bet-Ween the lshoe and the face of the wheel, and lprovide for amore effective dissipation of the heat generated, forming, as they do,passages through which air may flow, Vand increasing the radiatingsurface of the shoe. l

My vimproved brake shoe may be made by 'first forming a shoe withpockets or recesses in the flange portion thereof, and then introducingthe non-metallic substance `in the pockets, preferably in plastic form;or the non-metallic substance may be first molded or otherwise shapedinto blocks of suitable form and size, then placed in a mold and themolten metal from which the shoe is formed poured therein and about theblocks.

.The non-metallic Vor semi-metallic sub'- stance wherewith the recessesin the shoe are filled, maybe formed from various materials toringredients such as graphite, as#

bestos, pulverized trap rock, fire clay,- crushed slag,and similarsubstances havin`g the properties enumerated, and a higher specific heatthan cast iron, said materials being formed into blocks or inserts bymeans Iof any suitable binding material. I recommend, however, that thesubstance where- Y with the recesses o'r formed from a composition madeup of the ingredients mentioned below, as I have obtained better resultsby using such a com- Fire c1ay 1 part Crushed iron 'ore 3 parts Ironborings 3 Coal tar 1 par Asphalt part the Vingredients being firstthoroughly mixed and heated to about 112o F. and then pressed into therecesses or pockets.

In case the inserts are to he first formed as blocks to be placed in amold, and molten pockets are filled be cast iron poured about them, Irecommend the followingcomposition:

Fire clay 8 parts Crushed slag, 6 Graphite 3 under a pressure of aboutfifty tons per square inch.

invention, I claim and' desire to secure by Letters Patent 1. A brakeshoe comprising a body portion formed from cast metal and having acontinuous metallic surface adapted to contact with the t-read of aWheel, and a flange port-ion adapted to contact with the fiange of thewheel; said shoe having a recess .or pocket locatedentirel-y in the angeportion thereof and filled with a non-metallic substance.

2. A brake shoe comprising a body portion formed from cast metal andhaving a continuous metallic surface adapted to contact with the treadof a wheel, and a flange portion adapted to contact with the flange ofthe wheel, said shoe having a recess or pocket located entirely'in theflange portion thereof and filled with a -lion-metallic composition atleast one'ingredient of which has lubricating properties.

` Having thus described and explained my 1 3. A brake shoe comprising ,abody. portion vformed from cast metal and'having a continuous uniformlmetallic surface adapted to'con'tact with the tread ofa wheel, and aflange portion adapted to contact with the ,Lflan'ge of the wheel, saidshoe having a recess or pocket located entirely in the flange portionthereofand filled with a non-metallic substance having lubricatingproperties.

l1. A brakeshoe comprising a body portion formed from cast iron andhaving a 'continuous and uniform Ametallic surface adapted to contactwith the tread of a wheel, and a ange portion adapted to contact withthe flange of the wheel; said shoe having a recess or 'pocket locatedentirely in the flange portion thereof-f and iilled kwith a non-metallic' substance, and openings 'extending through said flange' portion.

Signed at Mahwah, in the county of Bergen, and State of New Jersey, this22 day of July, A. D. 1911.

Witnesses FRANK OsBoRN,

W. H. WINTERs.

